a(n)=[(n+1)(n+2)(n+3)...(2n)]/(1+2+3+...+n).
A110371
a(n)=[(n+1)(n+2)(n+3)...(2n)]/(1+2+3+...+n).
Terms
- a(0) =2a(1) =4a(2) =20a(3) =168a(4) =2016a(5) =31680a(6) =617760a(7) =14414400a(8) =392071680a(9) =12189864960a(10) =426645273600
External references
- oeis: A110371